Drill-chuck.



UNITED STATE-S PATENT onnicn.

GEORGE GARRETSON, OF SAN DIEGO, CALIFORNIA.

DRILL-CHUCK.

To all whom it may concern:

Be it known that I, GEORGE GARRETsoN, a

I citizen of the United States, residing at San Diego, in the county ofSan Diego and State ofCalifornia,,have invented new and usefulImprovements in Drill Chucks, of which the following is a specification.

, This invention is an improved drill chuck especially adapted for usein connection with the boring machine for which an application forLetters Patent of the United States has been made by Jefl'ersonKindleberger and George Garretson, but which chucks may also be used onother machines and in other connect ons and the said inventlon conslstsin the construction, combination and arview of the same taken on theplane indicated by the line a-a of Fig. 1. Fig. 8 is a detail elevationof the chuck sleeve or body.

In accordance with this invention, I provide a cylindrical chuck sleeveor body 1 whichis preferably made of steel and which I is adapted to besecured to a revolving member of a boring machine or device of anydescription and the interior diameter of which is of suitable size toenable the inner which are of anysuitable length and of end of a boringbit 2 tobe placed therein.

, The boring bit may be of suitable construction for boring metal orwood and I do not desire to limit myself in this particular. Said bit isprovided at a suitable distance from its inner end with a transverselydisposed pin 3 which provides studs & that project from opposite sidesof the bit. The

sleeve or body 1 is provided at its outer end with a tapered and reducedportion 5 which is externallyscrew threaded as at 6. Also at said endofthe sleeve or body are longitudinal slots 7 open at their outer ends andwhich any suitable number may be em- Specification of Letters Patent.

I Application filed September 4, 1908.

Patented May 25, 1909.

Serial No. 451,682.

ployed, said slots serving to divide the outer end of the said sleeve orbody into segmental jaw portions. The inner end of each slot is wedgeshaped as at 8. When the drill is placed with its inner end in saidsleeve or body, the studs 4 enter the slot 7 and coact therewith tocause the bit to rotate with said sleeve or body. In order to secure thebit in and to the sleeve or body, I also provide a nut 9 which isscrewed on the reduced tapered threaded portion 6 of the sleeve or body,serves to clamp the segmental jaws on the bit and also serves to forcethe studs 4: into the wedge shaped inner ends of the slots 7 so that thesaid studs are rigidly held in said slots and the bit is firmly grippedby the segment jaws and all lost motion between the bit and the tubularsleeve or body is entirely prevented.

Having thus described the invention, what is claimed as new is 1. In adevice of the class described, the

combination with a bit having studs projecting radially therefrom, atubular body having slots at one end to receive said studs and formingsegment jaws, said segment jaws being externally threaded and a nutscrewed on said segment jaws to clamp them on said bit and to force thesaid studs into the inner ends of said slots.

2. In a device of the class described, the combination with a bit havingstuds projecting radially therefrom, a tubular body having slots at oneend to receive said studs and forming segment jaws, said slots havingwedge-shaped inner ends, said segment jaws being externally threaded anda nut screwed on said segment jaws to clamp them on said bit and toforce the said studs into the wedge-shaped inner ends of said slots.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE GARRETSON.

